GEOL107 Lecture Notes - Lecture 6: Soil Horizon, Inceptisol, Ultisol
24 Sep 2017
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Document Summary
Soil - weathered accumulation of rock material that contains nutrients necessary to support life. Most plant root activity is in a and b layers. This profile is typical of mineral soils, as opposed to organic soils found in wetlands and floodplains. A is where plants roots and where there is the most soil flora and fauna - a horizon zone of leaching, water from above (think rain) dissolves soluble minerals in this horizon, second horizon to form. C is mostly parent material unaffected by the movement of water, minerals and soil particles - horizon zone of partially weathered bedrock , first horizon to form. O horizon zone dominated by organic material, top of soil generally last to form. Different types of soils found throughout world, differences caused mainly by varying climates and compositions of rocks. 2 major soils found in us pedalfers and pedocals.
